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(No Model.)

S. H. BARTLETT & H. E. WAITE.

TELEPHONE RELAY.

No. 251,406. Patented Dec. 27,1881.

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C2. Q n r M WITNESSES 0 Q By ZZez'r Attorneys Z,

WW v65 themes STATES PATE T Orrica,

SAMUEL H. BARTLETT AND HENRY E. WAITE, OF BRIDGEPORT, CONNECTI- GUT, ASSIGNORS TO OHARLES'F. LIVERMORE, OF NEW YORK, N. Y.

TELEPHONE-RELAY.

SPECIFICATION forming part of Letters Patent No. 251,400, dated December 2'7, 1881. Application filed August 31, 1881. (No model.)

To all whom it may concern:

Be it known that we, SAMUEL H. BARTLETT and HENRY E. VAITE, both of Bridgeport, county of Fairfield, State of Connecticut, have invented new and useful Improvements in Telephone-Relays, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is aplan or top view of ourimproved telephone-relay. Fig. 2 is a vertical section through the same, and Figs. 3 and 4 are vertical sections at right angles to Fig. 2 through the supports for the armature to the magnet.

Our invention relates to a novel relay for telephones for imparting or communicating a message delivered to and conveyed by one line to another, and independent line or lines by which it is further conveyed to the desired point; and it consistsin the combination,with the magnet and its coil or helix closing the circuit at the end of one line, of an adjustable armature or plate of steel or other magnetic metal, through which connection is made with and which forms a part of the transmitter of another and independent telephone line or circuit, whereby the messageimparted to and conveyed by onelineis com mu'nicated to and transmitted by another and independent line, as hereinafter explained.

It further consists in a novel arrangement of microphones and of split circuitor connections therewith in the transmitter portion of the relay, whereby the action of the latter is greatly improved, as hereinafter explained.

In the accompanying drawings, A represents abase-plate, of wood, rubber, or other suitable non-conducting material, upon which are arranged suitable uprights or supports, 0 O 0 for the support of the parts of the relay. The support or upright O is adapted to receive and support a magnet, D, having upon one end a coil, D, in which the wires d d of a first telephone line or circuit terminate. This line is complete in itself, being provided at the end opposite to the magnet O with a transmitter, T, of any preferred form or construction, and at any suitable point, connecting with a bat tery, B,through which the disturbances in the current in the transmitter are conveyed to the magnet D at the receiver end of the line.

Just in front of the end of the magnet D which projects through the coil is arranged a thin flat plate or strip, F, of steel or other magnetic material, which serves as a flexible armature to the magnet, and to which the dis.- turbancesinthelatterarecommunicated. This plate is supported rigidly at one end in an upright, 0 which has a vertical slit in its upper end to receive the end of the strip or plate F, and is provided with a clamping thumb-screw, G, for clamping the strip F firmly between the arms of the standard, as shown in Fig. 2.

The standard O is made adjustable upon the bed-plate A, in a path at right angles to the axis ofthe magnet, by means of slots formed in the bed-plate at a a, and suitable set-screws, h h, and nut-plate H, for clamping and holdin g the standard at any desired point. 'The plate F also has a longitudinal slot formed in it atf, where the clamping-screw G passes through it, this arrangement permitting the support for the plate to be set nearer to or farther from the axis of the magnet, for stiffening or for giving increased flexibility to the plate F, as may be required, by moving its point of support nearer to or farther from the magnet, its disturbing agent. The opposite or free end of the strip or plate F rests midway, or thereabout, between two vertical arms,0 C of upright or bracket 0, (see Figs. 1 and 3,) and is provided on its opposite vertical sides or faces with spurs or pointsii, which may beof platinum, carbon, or other suitable conducting material. I

Thearmsorlugs O have each a screwflck, provided on its inner end with a piece or button, l l, of carbon, against which the pointsi 41 rest or vibrate as the plate F is vibrated or disturbed by the action of the magnet or of the disturbances therein. The screws 70 7a, or the carbons connected therewith, have each a short wire, at or 112, connected with it, terminating by split connection in a line'wire, d of a second telephone line or circuit. The other wire, d of this second line is connected with the end of plate F, secured in the upright 0 either through the clamping-screw G, as shown, or in any other suitable manner.

The wires d and d, which through the connections described, are made to receive the disturbances in the magnet D,form an independent telephone line or circuit provided with its own battery, B, and terminating in any preferred form of receiver, It, or in a second relay similar to that above described, through which disturbances in said line are imparted to still another independent line.

The arrangement of theplate or armature F, in connection with the adjustable buttons 1 Z, of carbon or equivalent conducting material, upon its opposite sides, is such that the movement of or disturbance in the current in the plate or strip is carried out from both sides thereof to the line-wire of the second or relay line through the split connection describedan arrangementwhichhas been found to great- 1y increase the effectiveness of the apparatus, while the arrangement for adjusting the tension of the arm or plate F, or its power of resistance to the action of the magnet, as described, enables us to adapt it with precision to the requirements of the battery-power employed, and thereby to secure the best possible results.

It will be apparentthat variations in the current in the coil producingdisturbances in degree of polarity in the magnet will cause corresponding disturbances in the flexible armature, and when the latter is drawn inward toward the magnet, deflecting it slightly from a right line, it will causethe pointi to press with increased force upon the button I, while at the same time such deflection will tend to produce a scratching action of the points i and 41 upon the carbons, more particularly of the point t" on the carbon 1, the spurt'acting somewhat as a pivot for the spur i to vibrate upon. Supposing the equilibrium to be restored, and the armature to be then repelled or deflected outward away from the magnet, a reverse action of the points or spurs i and t" to that above described takes place. In this way, through the buttons 1 and 1, connecting with the same pole of the armature and having a split connection with the line, we are enabled to more fully utilize the disturbances in the flexible armature than we could by using the carbon on one side only thereof, and we therefore prefer the arrangement described.

We would state that we are aware that relays have been used in telephone-lines; but these, so far as we are aware, have only been adapted to short lines or branches not employing an independent battery for the transmis sion of the message imparted to it, and which consequently received and carried forward the induction of the main or battery line or circuit. In our arrangement the relay is designed for use at the terminus of one line after the message has been carried as far as is found to be effectively practicable under all the varying conditions of atmospheric changes, &c., and then, byinterposing the relay, to communicate the disturbances in the current of the firstline to a second and independent line, over which the message is conveyed by the power of its own battery, without communicating to or carryingforward thereon the induction of the first line.

By our construction and arrangement we are arranged and operated substantially asand for the purpose described.

In testimony whereof we have hereunto set our hands this 30th day of August, A. D. 1881.

SAMUEL II. BARTLETT. HENRY E. \VAITE.

\Vitnesscs:

C. H. HANKINSON, GEO. SAMUELs. 

